layout_bench/
layout_bench.rs

1use std::time::Instant;
2use ui_layout::*;
3
4fn make_node(is_flex: bool) -> LayoutNode {
5    LayoutNode::new(Style {
6        display: if is_flex {
7            Display::Flex {
8                flex_direction: FlexDirection::Row,
9            }
10        } else {
11            Display::Block
12        },
13        size: SizeStyle {
14            width: Length::Auto,
15            height: Length::Auto,
16            min_width: Length::Px(0.0),
17            max_width: Length::Px(10_000.0),
18            min_height: Length::Px(0.0),
19            max_height: Length::Px(10_000.0),
20        },
21        spacing: Spacing {
22            margin_left: Length::Px(2.0),
23            margin_right: Length::Px(2.0),
24            margin_top: Length::Px(1.0),
25            margin_bottom: Length::Px(1.0),
26            padding_left: Length::Px(1.0),
27            padding_right: Length::Px(1.0),
28            padding_top: Length::Px(1.0),
29            padding_bottom: Length::Px(1.0),
30            border_left: Length::Px(1.0),
31            border_right: Length::Px(1.0),
32            border_top: Length::Px(1.0),
33            border_bottom: Length::Px(1.0),
34            ..Default::default()
35        },
36        ..Default::default()
37    })
38}
39
40fn make_tree(depth: usize, max_depth: usize, remaining: &mut usize) -> LayoutNode {
41    let is_flex = depth % 2 == 0; // Flex -> Block -> Flex -> ...
42    let mut node = make_node(is_flex);
43
44    if depth >= max_depth || *remaining == 0 {
45        return node;
46    }
47
48    let max_children = if depth < 3 {
49        4
50    } else if depth < 6 {
51        3
52    } else if depth < 9 {
53        2
54    } else {
55        1
56    };
57
58    let child_count = max_children.min(*remaining);
59
60    let mut children = Vec::with_capacity(child_count);
61    for _ in 0..child_count {
62        if *remaining == 0 {
63            break;
64        }
65        *remaining -= 1;
66        children.push(make_tree(depth + 1, max_depth, remaining));
67    }
68
69    node.children = children;
70    node
71}
72
73fn main() {
74    const TOTAL_NODES: usize = 7_000;
75    const DEPTH: usize = 16;
76
77    println!("layout performance benchmark");
78    println!("TOTAL_NODES = {}", TOTAL_NODES);
79    println!("DEPTH       = {}", DEPTH);
80    println!("-------------------------");
81
82    let mut remaining = TOTAL_NODES - 1;
83    let mut root = make_tree(0, DEPTH, &mut remaining);
84
85    println!("remaining nodes unused = {}", remaining);
86
87    let t1 = {
88        let start = Instant::now();
89        LayoutEngine::layout(&mut root, 800.0, 600.0);
90        start.elapsed()
91    };
92
93    println!("1st layout: {:?}", t1);
94
95    let t2 = {
96        let start = Instant::now();
97        LayoutEngine::layout(&mut root, 800.0, 600.0);
98        start.elapsed()
99    };
100
101    println!("2nd layout: {:?}", t2);
102}
layout_bench/layout_bench.rs

layout_bench/
layout_bench.rs
